** Power Minerals PNN.AX soars as much as 25% to A$0.125, highest since December 5
** Lithium explorer set for best day since December 5
** Co terminates joint venture with Navigate Energy Technology for Rincon lithium project in Argentina, retaining 100% ownership of project
** Says, "Rincon JV did not represent the optimal value proposition for development of Rincon project"
** Adds discussions underway with potential new funding partners
** About 3.3 mln shares traded, 1.5x their 30-day average
** PNN fell 8.7% in 2025
(Reporting by John Biju in Bengaluru)
((John.Biju@thomsonreuters.com;))